Improvement in feeding air to furnaces



N EA L.

Feeding Air to Furnaces.-

Patented Sept. 7,1875.

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N. PETERS, PHOYQLITHOGRAFNER, WASHINGTON n c WILLIAM J. ONEAL, OF NEWPORT, KENTUCKY.

IMPROVEMENT IN FEEDING AIR TO FURNACES.

Specification forming part of Letters Patent No. 167,467, dated September 7, 1875 application filed January 7, 1875.

To all whom it may concern Be it known that I, WILLIAM J. ONEAL, of the city of Newport, State of Kentucky, have invented a Smoke-Consuming Furnace, of which the following is a specification:

The object of my invention is the more perfect combustion of coal in furnaces for steamboilers and such other places as it may be used; and consists in the manner of introducing cold air into the furnace through the bottom of combustion-chamber and heating the same before it reaches the flames of tire in combustionchamber; also, in the manner of introducing air or steam or both into the rear end of furnace.

In the accompanying drawing, Figure 1 is a side elevation of a steam-boiler with my improvements attached.

a is the boiler, and may be of any kind or pattern desired. 1) is a funnel-shaped airtube, made of malleable metal. a is an ordinary steanrdome. dis a steam-pipe leading from steam-dome to air-chamber j. e is an ordinary furnace under steam-boiler. f is an air-chamber, with sides and ends made of brick or iron, and top formed by the bottom of combustion-chamber and back of the first firewall, and a perforated metal plate covering the intervening space between the two. 9 is what I call a deflector, and is made of fireclay or other fire-proof substance, and is set on top of first bridge-wall, coming out flush with the face of same and running back horizontal with bottom of boiler about twelve inches. h is a second bridge-wall, made of fire-clay or other fire-proof substance, and is built from the bottom of the combustion-chamher, commencing about nine inches in rear of first bridgewall, with an arched top passing within about two inches of the back end of deflector g. 'i is an ordinary metal air-pipe, with its two ends resting in chambers f and j. J is an air-chamber, through which steam or air may be introduced into the back end of the combustion-chamber, through the perforated plate forming the front and top of the chamber. This chamber Iform by securing a perforated plate of fire-clay across the back lower corner of the combustion-chamber. K is the stand-pipe to the boiler. L is the muddrum. 0 is the flues in the boiler. Q is an ordinary damper to regulate the supply of air in chamber f.

The operation of a furnace with my device attached is as follows: When a fire is first built in the furnace the flame and smoke pass back over the first and second bridge-wall, in the ordinary way, until the second bridge-wall becomes heated sufficiently, when I open the damper Q and allow the air to pass into chamber f, thence through the perforated plate in jets, through the throat between the first and second bridge-wall, against the deflector g, which deflects the same, in the direction of the arrow, onto the heated surface of bridge-wall h, where the air becomes rarefied and, by its expansion, presses the flames up close against the boiler, thus more effectually utilizing the heat; and, by reason of the airs being lighter than the flames, as they come from the furnace heavily charged with carbon, I claim that the air rises and more thoroughly mixes with the carbon, and hence produces more complete combustion than when the air is introduced from the top of the combustion-chamber, and, for the purpose of further facilitating combustion, and at times to increase the draft of the furnace, I pass a current of air back from chamber f, through piped, into chamber j, and thence in jets through its perforated wall into the back end of the combustion-chamber; and as occasion may require to facilitate the draft, I introduce steam into chamber j through pipe d, and thus throw jets of steam and air combined into the back end of the combustion-chamber.

I claim as my invention 1. The above described smoke -consuming device, consisting of pipe b, air-chain ber f, de-

flecting-plate g, the second bridge-Wall h, pipe 1', back air-chamber J, and pipe d, combined and operated substantially as and for the purposes set forth.

2. The deflectingplate g, in combination with WILLIAM J. ONEAL.

Attest:

S. H. WHITMORE, L. STAGG. 

